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  1. #ifndef _ASM_X86_PGTABLE_32_DEFS_H
  2. #define _ASM_X86_PGTABLE_32_DEFS_H
  3.  
  4. /*
  5.  * The Linux x86 paging architecture is 'compile-time dual-mode', it
  6.  * implements both the traditional 2-level x86 page tables and the
  7.  * newer 3-level PAE-mode page tables.
  8.  */
  9. #ifdef CONFIG_X86_PAE
  10. # include <asm/pgtable-3level_types.h>
  11. # define PMD_SIZE       (1UL << PMD_SHIFT)
  12. # define PMD_MASK       (~(PMD_SIZE - 1))
  13. #else
  14. # include <asm/pgtable-2level_types.h>
  15. #endif
  16.  
  17. #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  18. #define PGDIR_MASK      (~(PGDIR_SIZE - 1))
  19.  
  20. /* Just any arbitrary offset to the start of the vmalloc VM area: the
  21.  * current 8MB value just means that there will be a 8MB "hole" after the
  22.  * physical memory until the kernel virtual memory starts.  That means that
  23.  * any out-of-bounds memory accesses will hopefully be caught.
  24.  * The vmalloc() routines leaves a hole of 4kB between each vmalloced
  25.  * area for the same reason. ;)
  26.  */
  27. #define VMALLOC_OFFSET  (8 * 1024 * 1024)
  28.  
  29. #ifndef __ASSEMBLY__
  30. extern bool __vmalloc_start_set; /* set once high_memory is set */
  31. #endif
  32.  
  33. #define VMALLOC_START   ((unsigned long)high_memory + VMALLOC_OFFSET)
  34. #ifdef CONFIG_X86_PAE
  35. #define LAST_PKMAP 512
  36. #else
  37. #define LAST_PKMAP 1024
  38. #endif
  39.  
  40. #define PKMAP_BASE ((FIXADDR_START - PAGE_SIZE * (LAST_PKMAP + 1))      \
  41.                     & PMD_MASK)
  42.  
  43. #ifdef CONFIG_HIGHMEM
  44. # define VMALLOC_END    (PKMAP_BASE - 2 * PAGE_SIZE)
  45. #else
  46. # define VMALLOC_END    (FIXADDR_START - 2 * PAGE_SIZE)
  47. #endif
  48.  
  49. #define MODULES_VADDR   VMALLOC_START
  50. #define MODULES_END     VMALLOC_END
  51. #define MODULES_LEN     (MODULES_VADDR - MODULES_END)
  52.  
  53. #define MAXMEM  (VMALLOC_END - PAGE_OFFSET - __VMALLOC_RESERVE)
  54.  
  55. #endif /* _ASM_X86_PGTABLE_32_DEFS_H */
  56.